Mass accuracy is very important in determining the composition of elements, but even if high-resolution FTMS mass spectrometry is used, if only one condition of mass accuracy is applied, we still cannot determine the unique chemical formula. On the other hand, correct mass spectra collected in contour mode, based on the correct isotope profile, we get a new measurement parameter-spectral accuracy. Using MassWorks software allows us to obtain a unique mass spectrum even with unit resolution Correct chemical formula
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